Fluid pressure operated pump



P 6, 1969 R. F. GREEN, JR

FLUID PRESSURE OPERATED PUMP 3 Sheets-Sheet 1 Filed Feb. 12, 1968 FIG. 2

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P 6, 1969 R. F. GREEN, JR

FLUID PRESSURE OPERATED PUMP s Sheets-Shet 2 Filed Feb. 12, 1968 m/INVENTOR ROBEEQ T F. GREEN Jr.

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United States Patent M US. Cl. 103-152 7 Claims ABSTRACT OF THEDISCLOSURE A fluid pressure actuated pump includes a pair of flexiblediaphragms with a plunger extending through the pressure actuateddiaphragm and secured at one end to the pumping diaphragm. A furtherchamber communicates with the fluid pressure chamber and an outletextending from the further chamber to a position below the pump. A spoolis slidably mounted on the other end of the plunger and has a valvethereon for controlling the flow of fluid under pressure from thepressure chamber to the outlet and bearing against a coil springextending between the spool and the other end of the plunger so that asfluid under pressure flows past the valve to fill the outlet, suctionpressure is created thereby to cause the spool to slide in the directionto seat the valve and permit the fluid pressure to flex the diaphragmsin one direction against the coil spring pressure and which now forcesthe spool to slide in the opposite direction to open the valve andrelease the fluid in the outlet and in the pressure chamber to cause thediaphragms to flex in the opposite direction.

This invention relates to pumps and is more particularly directed to afluid pressure operated pump utilizing both fluid and atmosphericpressures.

A principal object of the present invention is to provide a pump usingfluid power and atmospheric pressure as the power source of the pump.

Another object of the present invention is to provide a chemical pumpthat uses the ordinary domestic water supply as its motive power withoutthe usual intricate valve system for controlling the fluid pressure.

A further object of the present invention is to provide a chemical pumpusing Water pressure as well as atmospheric pressure for pumping aliquid chemical and discharging it approximately the same pressure asthat of the water used as the motive power.

A still further object of the present invention is to provide a pumputilizing water and atmospheric pressures for actuating the pump andwhich is simple in construction and design and most effective inoperation.

With these and other objects in view, the invention will be bestunderstood from a consideration of the following detailed descriptiontaken in connection with the accompanying drawings froming a part ofthis specification, with the understanding, however, that the inventionis not confined to any strict conformity with the showing of thedrawings but may be changed or modified so long as such changes ormodifications mark no material departure from the salient features ofthe invention as expressed in the appended claims.

In the drawings:

FIGURE 1 is a perspective View of a pump utilizing fluid pressure andatmospheric pressure as its source of power.

FIGURE 2 is a cross sectional view taken at the center of the pump withthe various parts shown in their neutral or starting position.

FIGURES 3 to 6 inclusive are similar views showing the position of thevarious parts thereof in a single cycle of operation of its pumpingaction.

3,467,021 Patented Sept. 16, 1969 Referring to the drawings wherein likenumerals are used to designate similar parts throughout the severalviews, the numeral 10 refers to my fluid operated pump 10 consisting ofa plurality of blocks 11, 12, 13 and 14 secured together by screw boltsas shown to form a small, compact yet efficient device for pumpingchemicals by use of water pressure. The blocks 11, 12, 13 and 14 havebeen bored to form cavities therein, block 11 having a relatively largediameter cavity 16 joined by a smaller concentric bore 15 of greaterdepth, which in turn communicates with a cavity of slightly smaller bore27 to form a shoulder 28 therebetween. At the juncture of cavities 15and 16, the block 11 is bevelled as at 29, whose function is explainedin detail hereinafter. The cavity 27 communicates with a duct 17 towhich is connected a water outlet tubing 30 that extends for a distanceof at least five feet below the pump 10 since atmospheric pressure isutilized in the proper operation of the pump.

The clamping block 12 is provided with a cavity 18 that extends throughthe full depth of the block 12 and is approximately equal in diameter tothat of the cavity 16. Communicating with the cavity 18 in the block 12is a cavity 19 of smaller diameter formed in the block 13. The end block14 is provided with a cavity 20 of equal diameter to that of the cavity19. Ducts 21 and 22 connect the cavity 20 with a chemical feed inlettubing 31 and outlet tubing 32 respectively. The cavity 16 of the block11 communicates with a duct 23 to which a water pressure inlet tubing 33is connected.

Between blocks 11 and 12 is a flexible diaphragm 24 secured therebetweenat its peripheral portion and provided with a centrally disposed opening34 through which extends a stem 35 of a plunger P. Secured to one sideof the flexible diaphragm 24 is an inflexible member 25 also providedwith a bore concentric with the bore 34. The plunger P has an enlargedportion 36 which forms a shoulder 37 that engages the inflexible member25, the end of the plunger P being provided with a head portion 38 whichbears against and is secured to a flexible diaphragm 26 that is itselfclamped between the blocks 13 and 14.

Slidably mounted on the stem 35 of the plunger P is a spool 40 that isprovided with a shoulder 41 adapted to engage the shoulder 28 betweenthe cavities 15 and 27. At one end of the spool 40 is a peripheralgroove 42 in which an O-ring 43 is positioned. At the other end of thespool 40 is a concentric slot 44 in which a packing or sea] 45 ismaintained by a washer 46 to prevent leak age of fluid past the stem 35.Extending between the washer 46 and a second washer 47 secured to theend of the stem 35 is a coil spring 48 yieldingly urging the washers 46and 47 in a direction away from each other. Interposed between theflexible diaphragm 24 and the spool 40 is a spacer block 50 which ismounted on the plunger shaft 35, the diaphragm 24 being interposedbetween the rigid blocks 25 and 50. Mounted on the tubing 31 and 32 arecheck valves 51 and 52 respectively, the check valve 51 permitting theflow of fluid one way from a source (not shown) through the tubing 31,duct 21 and chamber 20 and the check valve 52 permitting the flow offluid from the chamber 20, through duct 22, and tubing 32 to a point ofdischarge (not shown).

In the normal operation of my fluid operated pump 10, the inlet tubing33 is connected to a source of fluid under pressure, as for examplewater from the usual domestic water supply system which has its waterflowing at approximately 30 pounds pressure. The waste tubing 30 shouldextend downwardly from the pump 10' and so oriented that its dischargeend is open and approximately five feet below the pump 10 so that whenthe line 30 is filled and Water captured therein as explained in detailhereinafter, a suction effect is created in the cylinder 15 equivalentto 4.41" Hg which is equal to 2.16 p.s.i. of negative pressure. Thetubing 31 is connected to a source of fluid to be pumped by pump and thetubing 32 connected to a point of discharge for the fluid being pumped.

When water under pressure is permitted to flow into the tubing 33, withthe various parts of the pump 10 in their neutral position, as shown byFIGURE 2, the water will flow through the duct 23 and enter the chamber16, and leave the chamber 16 by flowing past the O-ring of the spool 40,the bevelled surface 29 and into the chambers and 27. The watercontinues to flow through the duct 17 and into the waste tube 30. Whenthe waste tube 30 has filled with water and is beginning to dischargetherefrom, the suction created causes the spool 40 to slide inwardlyalong the stem 35 into the cylinder 15 partly cornpressing the coilspring 48. Since the coil spring 48 bears against the head washer 47,the spring force causes the plunger P to slide inwardly carrying with itthe rigid member and flexible diaphragm 24 as well as the flexible orpumping diaphragm 26. As a result of this action, the movement of theflexible diaphragm 26 outwardly of the chamber 20 from the positionshown by FIGURE 2 to the position shown by FIGURE 3, fluid or chemicalswill be drawn into the chamber 20 via the inlet tubing 31 past the checkvalve 51 and through the duct 21.

When the O-ring 43 engages the bevelled surface 29 at the mouth of thecavity 15, as shown by FIGURE 3, the flow of water from the chamber 16to the chamber 15 is cut off. The column of water in the waste tube 30is now established and the water in the chambers 15 and 27 and the duct17 and waste tubing 30 is retained therein. The suction efIect createdby the water retained in the waste tube 30 continues the movement of thespool 40 inwardly of the chamber 15 until the shoulder 41 of the spool40 engages the shoulder 28 at the end of the chamber 15. During thistime water pressure caused by the retention of the water in the chamber16 will bear against the flexible diaphragm 24 and cause it to flexoutwardly from the position shown by FIGURE 3 to that shown by FIGURE 4.At the same time the pumping diaphragm 26 has been flexed inwardly ofthe chamber 20 to discharge the fluid therein through the duct 22,tubing 32 and check valve 52. This pumping action is continued as thecoil spring arrives at its completely compressed condition and becomesin effect a solid cylinder or tube about the stem 35 and interposedbetween the washers 47 and 46 as shown by FIGURE 5.

The full force being exerted by the water pressure in the chamber 16 onthe flexible diaphragm 24 is now transmitted by the rigid member 25 tothe stem 35 and spring 48 to slide the spool outwardly of the cavity 15simultaneously with the outward movement of the plunger P. The pumpingdiaphragm 26 is now flexed to its extreme inward position as shown byFIGURE 6 and the chamber 20 is evacuated of its contents through thedischarge tubing 32.

When the spool 40 has moved to the position shown by FIGURE 6 and theO-ring 43 arrived at the position of the bevelled surface 29, watercontained in the chamber 16 will commence to flow into the cavity 15releasing the pressure against the flexible diaphragm 24. The watercontained in the waste pipe 30 will now be discharged as the suctioneffect previously caused by the captivated water therein is nowdissipated and no longer is present. The coil spring 48 will now exertits force against both washers 47 and 46 to cause the plunger P to slideoutwardly of the chamber 19 as the spool 40 continues to slide into thechamber 16 to the position shown by FIG- URE 2. At this time the pumpingdiaphragm 26 becomes flexed outwardly of the chamber 19 to draw in fluidor chemical through its inlet tubing 31. The cycle of operation of mypump 10 is now completed and the pumping action is continued as thecycle of operation is repeated. It is to be noted that the size of thespool 40 and the strength of the coil spring 48 are such that thesuction 4 pressure created by the column of water in the waste pipe 30is adequate to overcome the spring pressure 48.

What I claim as new is:

1. A fluid pressure operated pump comprising a body member, a fluidpressure actuated diaphragm and a pumping diaphragm mounted in said bodymember, said diaphragms having a first and second chamber contiguouswith said diaphragms respectively, a third chamber communicating withboth of said diaphragms, and a fourth chamber communicating with saidfirst chamber, said first and second chambers having an inlet and anoutlet, said outlet of said first chamber extending from said fourthchamber to a position below said body member, said fluid pressureactuated diaphragm having an opening, a plunger mounted in said firstchamber, extending into said fourth chamber and through said opening insaid fluid pressure actuated diaphragm and engaging said pumpingdiaphragm at one end, a spool slidably mounted on said plunger at theother end and positioned in said first and fourth chambers, valve meansmounted on said spool controlling the flowing of fluid from said firstchamber to said fourth chamber and spring means extending between saidspool and said plunger at said other end, said spring means yieldinglyurging said valve means in a direction permitting the flow of fluidunder pressure from said first chamber to said fourth chamber to bedischarged through said outlet positioned below said body member wherebyupon the flow of fluid under pressure into said first chamber, past saidvalve means into said fourth chamber and fills said outlet positionedbelow said body member, the suction created by said head of fluid insaid last named outlet causing said spool to slide in a directionagainst said spring pressure and seat said valve means to commence thereciprocal movement of said plunger and the pumping action of saidpumping diaphragm.

2. The structure as recited by claim 1 wherein said fourth chamber isprovided with stop means limiting the sliding of said spool into saidfourth chamber and compress said coil spring.

3. The structure as recited by claim 2 wherein said fluid under pressurecaptured in said first chamber flexes said fluid pressure actuateddiaphragm outwardly of said first chamber causing said spool and saidplunger to slide outwardly of said first and fourth chambers and saidpumping diaphragm to be flexed inwardly of said third chamber andcontinue the pumping action thereof.

4. The structure as recited by claim 3 wherein upon the completion ofsaid pumping action of said pumping diaphragm in said one direction,said valve means is brought to its open position and said fluid underpressure is permitted to flow into said fourth chamber and be dischargedthrough said outlet whereby said fluid pressure actuated diaphragm isflexed inwardly of said first chamber by said coil spring to continuethe pumping action.

5. A fluid operated pump comprising a plurality of block members, apressure actuated and pumping flexible diaphragms in side by siderelation engaged at their peripheral portion by said block members, saidblock membershaving a chamber on each side of said diaphragms, namelypressure chamber, pumping chamber and adjacent chambers, said adjacentchambers being in communication with each other, a further chambercommunicating with said pressure chamber and said pressure actuateddiaphragm, a fluid inlet and outlet connected to said pumping chamber ofsaid pumping diaphragm, an inlet duct connected to said pressure chamberof said pressure actuated diaphragm, an outlet duct connected to saidfurther chamber and extending below said block members, said pressureactuated diaphragm having an opening, a plunger mounted in said pressurechamber of said pressure actuated diaphragm, extending into said furtherchamber and into said adjacent chamber of said pumping diaphragm, oneend of said plunger being secured to said pumping diaphragm, a spoolslidably mounted on said plunger and extending into said further chamberand said pressure chamber of said pressure actuated diaphragm, a coilspring mounted on said plunger and extending between said other end ofsaid plunger and said spool, valve means mounted at said end of saidspool in said further chamber to permit the flow of fluid under pressureinto said further chamber and said outlet, said further chamber havingside walls forming a valve seat whereby upon the sliding of said spoolinto said further chamber, said valve means becomes seated to preventthe further flow of fluid under pressure into said further chamber andthereby retain the fluid in said outlet and effect suction pressure onsaid plunger and said spool.

6. The structure as recited by claim 5 taken in combination withshoulder means in said further chamber and said spool limiting thesliding movement of said spool into said further chamber and thecompression of said coil spring whereby upon the filling of saidpressure chamber of said pressure actuated diaphragm with fluid underpressure, said last named diaphragm will flex outwardly causing saidplunger and said spool to slide in the direction away from said furtherchamber and said pumping diaphragm becoming flexed inwardly of saidpumping chamber to pump fluid from said pumping chamber.

7. The structure as recited by claim 6 whereby upon the sliding of saidvalve means into said pressure chamber of said pressure actuateddiaphragm, said valve means opens releasing the pressure of the fluid inthe pressure chamber and the suction effect of the fluid in said outletand said coil spring causes said plunger to slide inwardly of said otherchamber and said pumping diaphragm to be flexed outwardly of the pumpingchamber to pump fluid into said pumping chamber and continue the pumpingaction of said plunger.

References Cited UNITED STATES PATENTS 514,608 2/1894 Weatherhead 2301622,307,566 l/1943 Browne 103-152 ROBERT M. WALKER, Primary Examiner

